Table 1.

Sample characteristics.

	Intervention	Control
	n = 417	n = 460
	n (%)	n (%)
Gender
Female	209 (50%)	204 (44%)
Male	208 (50%)	256 (56%)
Ethnicity
Latino	358 (86%)	390 (85%)
Non-Latino white	36 (7%)	46 (10%)
Non-Latino other	20 (5%)	21 (5%)
Not reported	3 (1%)	3 (1%)
Insurance
Medi-Cal	283 (74%)	255 (52%)
Uninsured	11 (3%)	8 (2%)
Private	1 (<1%)	0 (0%)
Not reported	122 (32%)	197 (40%)
Reminder type (intervention group, n = 417)
Mailed letter	158 (38%)	–
Text message	139 (33%)	–
Robocall	120 (28%)	–
HPV vaccine dose group
Due for 1st vaccine dose	249 (60%)	309 (67%)
Due for 2nd vaccine dose	168 (40%)	151 (33%)
Outcomes (at 4-month follow-up)
Received next-dose vaccine	94 (23%)	56 (12%)
Reminder delivered (intervention group)	352 (84%)	–